He'll be replaced by quarterbacks coach Clyde Christensen, a former Colts offensive coordinator.

Arians was the interim coach for the Colts since October after coach Chuck Pagano was diagnosed with a rare form of leukemia, which he has bravely battled to return to the sidelines for the AFC South team's regular-season finale win over the Houston Texans last week.

The Colts are 11-5 for the season, going 9-3 under Arians' leadership.